Fixed setup.py installation problem by adding numpy and include_dirs

I fixed `numpy/arrayobject.h` problem by adding few lines in `setup.py`.

See recommendation from http://stackoverflow.com/questions/14657375/cython-fatal-error-numpy-arrayobject-h-no-such-file-or-directory

After I fixed that. Now, in C2S directory, I can do:
```python
python setup.py build
sudo python setup.py install
```

Moreover, you may consider adding more installation in C2S.